question about cooked ground beef

I don’t know if this is the right place for this question but I need someone to clear this up for me. I recently bought a pound of good quality grass fed 97/3 ground beef. If i’m not mistaken, it’s one pound when raw, and after cooking it some weight is lost through the fat. However, i weighed it after cooking and it was only 12oz! my scale isn’t broken and is accurate and i didn’t weigh it wrong or anything. i weigh stuff everyday so it’s not that. It doesn’t make any sense at all that 25% of the weight would be lost in the cooking process when only 7% of the weight is consisted of pure fat. The only reasonable explanation to me is that it wasn’t 1 pound to start out with but that would be pretty disappointing that a high quality reputable brand would be ripping you off some ground beef. Someone please give me a reasonable explanation for this.

question about cooked ground beef